COOLING SYSTEM - M.2
approximately
3/8
in
(10
mm)
on
the
longest
unsupported length of the belt (see Fig. M.1).
To prevent premature wear and eventual failure,
correct tension of this belt should be maintained by
periodical checking and adjustment every 250 hours.
Excessive belt tension, and consequent overloading
of the dynamo/alternator and water pump bearings, is
detrimental to both belt and bearings and may cause
complete failure of one or both of these components.
Insufficient belt tension, allowing belt slip, will impair
the efficiency of the engine cooling system and
adversely affect dynamo/alternator output.
Belt adjustment is obtained by altering the position
of the dynamo/alternator in the following manner.
1.
Slacken off the dynamo/alternator adjusting
lever setscrew, the adjusting lever to timing case
setscrew and the dynamo/alternator to bracket
support bolts.
2.
The dynamo/alternator is now free to be moved
on its support bracket towards or away from the
engine to obtain the correct belt tension. Hold
the dynamo/alternator in the desired position.
3.
Tighten the adjusting lever setscrew, the lever to
timing case setscrew and the dynamo/alternator
to bracket support bolts.
4.
Check that the tension is still correct.
NOTE: When a new belt is fitted it is
advisable to re-check the adjustment after a
short running period. New belts are subject
to initial stretch and early readjustment may
be necessary.
Fig. M.1.
To Remove the Belt
1.
Slacken off the dynamo/alternator adjusting
lever setscrew, the adjusting lever to timing case
setscrew and the bracket support bolts. Pivot
the dynamo/alternator towards the cylinder
block.
2.
Turn the engine by hand and work the belt off
the water pump and dynamo/alternator pulleys.
3.
Remove the belt from the crankshaft pulley.
4.
Examine the belt for wear or fraying and renew
as necessary.
To Refit the Belt
Refitting the belt is a reversal of the removal
operations. Adjust the fan belt tension as detailed. If a
new belt is fitted, check the tension after a few hours of
running to ensure that any slackness due to initial
stretching is corrected.
FRESH WATER PUMP (Closed Circuit)
This is of the centrifugal type, the pump shaft which
rotates within two bearings is belt driven by means of a
pulley pressed onto one end and secured with a self
locking nut. The drive is transmitted through the shaft to
an impeller which is pressed onto the other end of this
shaft.
The impeller assists the circulation of the coolant
around the system. Water is contained within the
impeller chamber by means of a spring
Fig. M.2.
Removing the Water Pump.
